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AppGameKit Classic Chat / [BUG] Tier 1 agk_invert is not what it says in the documentation

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janbo
16
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Joined: 10th Nov 2008
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Posted: 16th Aug 2017 16:16 Edited at: 16th Aug 2017 18:17
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Beware it is a shader coding issue !

Preben and I came to the result that agk_invert can't get 1 as we/I needed it to be
I tested agk_invert == 0 and agk_invert > 0 works but not agk_invert == 1
Documentation says: float agk_invert - 1 if drawing to an image, 0 if drawing to the screen, only needed by quads
_______________________________________^ that "-" dosn't belong to the 1 it is the "enumeration" sign ...you can find it at the bottom of the shader guides docu

right now i use float(agk_invert>0.0) as workaround till i know what agk_invert is supposed to be or is fixed

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MikeMax
AGK Academic Backer
12
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Posted: 16th Aug 2017 16:25
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janbo,

you could have precised that is a "shader coding issue" in the title ? i got 2 minutes to understand the meaning of your post lol (sorry ! lol)
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janbo
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Posted: 16th Aug 2017 16:33 Edited at: 16th Aug 2017 16:38
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Sorry like so ?

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MikeMax
AGK Academic Backer
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Posted: 16th Aug 2017 17:12
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lol i love the added big text in bold :p thanks janbo !
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Paul Johnston
TGC Developer
22
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Posted: 16th Aug 2017 20:00
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Sorry, poor formatting on my part, I'll change them to equals signs. The statement is also incorrect, the value will equal -1 when drawing to an image, and 1 when drawing to the screen. I've fixed it in the online help files.
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janbo
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Posted: 16th Aug 2017 20:52 Edited at: 16th Aug 2017 21:08
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I'll test this again... to be sure

Well as I need a value between 0 and 1 I use (agk_invert * 0.5 + 0.5) now
This is the whole line ndc = vec2(ndc.x, mix(ndc.y,1.0-ndc.y, agk_invert * 0.5 + 0.5));
It works but if someone have a better idea how to invert the ndc in relation to agk_invert please tell me

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